I have a NavigationSplitView with a sidebar. When selecting a new item on the sidebar, the app crashes. The error message says:
Simultaneous accesses to 0x6000030107f0, but modification requires exclusive access.
Xcode shows that the crash occurs inside the generated code in my class with @Observable macro.
@ObservationIgnored private let _$observationRegistrar = Observation.ObservationRegistrar()
internal nonisolated func access<Member>(
keyPath: KeyPath<NavModel , Member>
) {
_$observationRegistrar.access(self, keyPath: keyPath)
}
internal nonisolated func withMutation<Member, MutationResult>(
keyPath: KeyPath<NavModel , Member>,
_ mutation: () throws -> MutationResult
) rethrows -> MutationResult {
// Crash occurs on the following line
try _$observationRegistrar.withMutation(of: self, keyPath: keyPath, mutation)
}
@ObservationIgnored private var _section: SidebarSection? = .one
To reproduce the crash, I tap a new item on the sidebar until the app crashes. It usually only takes 1-3 times selecting a new item before the crash occurs.
Below is the code for an entire app to reproduce the crash. Has anyone else encountered this issue? Thank you!
import SwiftUI
@main
struct NavigationBugApp: App {
var body: some Scene {
WindowGroup {
ContentView()
}
}
}
@Observable
class NavModel {
var section: SidebarSection? = .one
}
enum SidebarSection: Hashable {
case one
case two
}
struct ContentView: View {
@State private var model = NavModel()
var body: some View {
NavigationSplitView {
List(selection: $model.section) {
NavigationLink("One", value: SidebarSection.one)
NavigationLink("Two", value: SidebarSection.two)
}
.listStyle(.sidebar)
} detail: {
Text("Hello World")
}
}
}
#Preview {
ContentView()
}
